U.S. patent application number 10/773331 was filed with the patent office on 2004-08-12 for back light module.
This patent application is currently assigned to AU Optronics Corporation. Invention is credited to Wu, Chih-Kang.
Application Number | 20040156185 10/773331 |
Document ID | / |
Family ID | 32823104 |
Filed Date | 2004-08-12 |
United States Patent
Application |
20040156185 |
Kind Code |
A1 |
Wu, Chih-Kang |
August 12, 2004 |
Back light module
Abstract
A back light module in which the diffuser board has integrated
bottom support rods that are stopped at the bottom wall of the lamp
case of the back light module to support the diffuser board in
shape and to protect the diffuser board against deformation when
the diffuser board installed in the lamp case.
Inventors: |
Wu, Chih-Kang; (Taotyan
Hsien, TW) |
Correspondence
Address: |
BRUCE H. TROXELL
SUITE 1404
5205 LEESBURG PIKE
FALLS CHURCH
VA
22041
US
|
Assignee: |
AU Optronics Corporation
|
Family ID: |
32823104 |
Appl. No.: |
10/773331 |
Filed: |
February 9, 2004 |
Current U.S.
Class: |
362/632 |
Current CPC
Class: |
G02F 1/133606 20130101;
F21Y 2103/00 20130101; F21V 17/10 20130101 |
Class at
Publication: |
362/031 |
International
Class: |
F21V 007/04 |
Foreign Application Data
Date |
Code |
Application Number |
Feb 10, 2003 |
TW |
092102690 |
Claims
What the invention claimed is:
1. A back light module comprising a lamp case, said lamp case
having a bottom wall and a top open side, a plurality of lamp tubes
fixedly mounted inside said lamp case, and a diffuser board
fastened to the top open side of said lamp case and suspending
above said lamp tubes, wherein said diffuser board has a plurality
of bottom support members formed integral with a bottom wall
thereof and respectively stopped at the bottom wall of said lamp
case to support said diffuser board against deformation.
2. The back light module of claim 1, wherein said bottom support
members are respectively perpendicularly extended from the bottom
wall of said diffuser board.
3. The back light module of claim 1, wherein said bottom support
members are injection-molded with said diffuser board in
integrity.
4. The back light module of claim 1, wherein said diffuser board is
made of acrylics.
Description
BACKGROUND OF THE INVENTION
[0001] 1. Field of the Invention
[0002] The present invention relates to a back light module, and
more particularly, to a back light module in which the diffuser
board has bottom support rods that support the diffuser board in
shape.
[0003] 2. Description of the Related Art
[0004] A back light module is an essential assembling component of
the display screen of a notebook computer or LCD monitor, generally
including a lampshade or lamp case, lamp tubes fixedly mounted in
the lampshade or lamp case, and a diffuser board (light guide
plate). FIG. 1 illustrates a back light module according to the
prior art. According to this design, lamp tubes B are fixedly
mounted inside a casing A, and a diffuser board C is suspending
above the lamp tubes B. This design of back light module is not
satisfactory in function because the diffuser board C tends to
curve inwards due to the effect of its gravity weight and ambient
temperature and moisture. FIG. 2 shows another design of back light
module in which support members D are mounted inside the casing A
to support the diffuser board C above the lamp tubes B. This design
eliminates the drawback of the design shown in FIG. 1, however its
manufacturing cost is high. Further, because the support members D
are respectively and perpendicularly fastened to the bottom wall of
the casing A by a respective screw joint, it is difficult to keep
the top ends of the support members D in flush.
SUMMARY OF THE INVENTION
[0005] The present invention has been accomplished under the
circumstances in view. It is one object of the present invention to
provide a back light module, which protects the diffuser board
against deformation. It is another object of the present invention
to provide a back light module, which is inexpensive to
manufacture. To achieve these and other objects of the present
invention, the back light module comprises a lamp case, a plurality
of lamp tubes fixedly mounted inside the lamp case, and a diffuser
board fastened to the top open side of the lamp case and suspending
above the lamp tubes. The diffuser board has a plurality of bottom
support members formed integral with the bottom wall thereof and
respectively stopped at the bottom wall of the lamp case to support
the diffuser board against deformation.
BRIEF DESCRIPTION OF THE DRAWINGS
[0006] The present invention can be more fully understood by
reference to the following description and accompanying drawings,
in which:
[0007] FIG. 1 is a sectional view showing a back light module
according to the prior art;
[0008] FIG. 2 is a sectional view showing another design of back
light module according to the prior art;
[0009] FIG. 3 is an exploded view of the preferred embodiment of
the present invention; and
[0010] FIG. 4 is a sectional assembly view of the preferred
embodiment of the present invention;
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT
[0011] Referring to FIGS. 3 and 4, a back light module in
accordance with the present invention is shown comprised of a lamp
case 1, a plurality of lamp tubes (not shown) mounted inside the
lamp case 1, and a diffuser board 2 fastened to the top open side
of the lamp case 1. The lamp case 1 is preferably made of metal.
The diffuser board 2 has a plurality of bottom support rods 21
respectively formed integral with and perpendicularly extended from
the bottom sidewall thereof to a distance corresponding to the
depth of the lamp case 1. The bottom support rods 21 are equal in
length (height). The bottom support rods 21 are preferably
injection molded with the diffuser board 2 from acrylics.
[0012] When the diffuser board 2 covered on the top open side of
the lamp case 1, the bottom support rods 21 are positively stopped
at the bottom wall of the lamp case 1 to support the diffuser board
2 in shape, preventing deformation of the diffuser board 2 due to
the effect of ambient temperature and moisture.
[0013] A prototype of back light module has been constructed with
the features of FIGS. 3 and 4. The back light module functions
smoothly to provide all of the features discussed earlier.
[0014] Although a particular embodiment of the invention has been
described in detail for purposes of illustration, various
modifications and enhancements may be made without departing from
the spirit and scope of the invention. For example, an independent
battery case can be provided and detachably fastened to the cap
body to hold the battery set. Accordingly, the invention is not to
be limited except as by the appended claims.
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